化学修饰的吸附树脂对2,4,6-三氯苯酚的吸附研究

合成了用邻羧基苯甲酰基或苯甲酰基修饰的新型聚苯乙烯-二乙烯苯吸附树脂ZH-01, ZH-02和ZH-03, 利用瓶点法研究了它们和Amberlite XAD-4对288～318 K下水溶液中2,4,6-三氯苯酚的静态吸附和静态脱附特征以证实吸附质与吸附剂之间存在化学吸附, 并利用半经验分子轨道法(AM1)计算的几种吸附剂和2,4,6-三氯苯酚的前线轨道近似能级进行了解释. 结果表明: 经邻羧基苯甲酰基或苯甲酰基化学修饰后的树脂ZH-01, ZH-02和ZH-03对水溶液中2,4,6-三氯苯酚的吸附过程在合适温度时会使酚羟基和吸附剂表面的羰基发生作用, 对吸附剂进行适当的化学修饰后, 对2,4,6-三氯苯酚的穿透吸附容量均为Amberlite XAD-4树脂的150%, 饱和吸附容量是Amberlite XAD-4树脂的114％～128％.

Study on the Adsorption of 2,4,6-Trichlorophenol with Chemically Modified Adsorption Resins

New poly(styrene-divinylbenzene) adsorption resins modified with 2-carboxylbenzoyl (ZH-01) or benzoyl (ZH-02 and ZH-03) group were prepared. The static adsorption and static desorption characteristics for 2,4,6-trichlorophenol in aqueous solution onto above adsorption resins and Amberlite XAD-4 in the temperature range of 288～318 K were studied with bottle point method to confirm the existence of chemisorption between adsorbate and adsorbent, which was interpreted by the approximate orbital energy level of several adsorbents and 2,4,6-trichlorophenol calculated with the semiempirical molecular orbital method AM1. The result shows that the interaction between hydroxyl group in 2,4,6-trichlorophenol and 2-carboxylbenzoyl or benzoyl group on the modified adsorbents will exist in the adsorption system of 2,4,6-trichlorophenol in aqueous solutions with ZH-01, ZH-02 or ZH-03 at the proper temperature. The breakthrough and total adsorption capacities of 2,4,6-trichlorophenol in aqueous solutions with the modified adsorption resins increased to 150% and 114%～128% compared to that with Amberlite XAD-4.